Not sure if 'outfits to choose from' counts as a 'clothing system' by your standards, but...
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Ambrosia: you have a variety of different options, and there is a certain amount of exhibitionism to it (though it's not a particular focus of the game, per se). If I recall correctly, said outfit options are tied to a corruption statistic, but I might be remembering wrong there.
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Brave Alchemist Colette: mostly the same deal as the above, honestly.
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Hana's Exposure: it
sort of has a clothing system and is generally oriented around exhibitionism (duh), so you might well like it. Just beware bugs and a
very slow update schedule, if past experiences are anything to go by.
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Yorna: Monster Girl's Secret: again, its clothing system is pretty standard 'outfit selection,' but unlike the two above its outfits aren't just cosplay ripoffs (bloomers, school swimsuits, etc etc). They all actually look pretty good, and what you can wear is determined by how 'willing' you are to show yourself off. Even still, I wouldn't so much say that it's focused on exhibitionism, if that's an absolute condition of yours.
Proper clothing systems, with each piece being individually wearable/removable:
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Lust Doll Plus: not so much in the way of exhibitionism, at least not as far as I remember, but it does have what you wanted as far as clothes are concerned.
This is kinda pushing it a little, since it's more text-based than 2D, but
Degrees of Lewdity might be to your liking. It's got its fair share of events dedicated to exhibitionism, and a fully fleshed-out clothing system to boot. On the other hand, its art takes the form of a 2D sprite representing your character at all times / during sex scenes, so maybe not the best for you.
Also, you might wanna check out HH Works' games if you haven't yet. They're pretty invariably focused on exhibitionism, as far as I can tell, and some of them likely have a clothing system supplementing that.
